mathematics

Telephone numbers in South Korea

Telephone numbers in South Korea is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Telephone numbers in South Korea rather than just read about it. In short: Telephone numbers in South Korea are organised and assigned under the regulation of the Ministry of Science and ICT, under the Bylaw for the Administration of Telecommunication Numbering. Overview International call out: 00N (where N is the carrier code) followed by the distant country code and telephone number.

Key takeaways

Telephone numbers in South Korea belongs to mathematics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Telephone numbers in South Korea to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Telephone numbers in South Korea from memory before moving on to harder problems.

Reference excerpt

Telephone numbers in South Korea are organised and assigned under the regulation of the Ministry of Science and ICT, under the Bylaw for the Administration of Telecommunication Numbering.

Overview International call out: 00N (where N is the carrier code) followed by the distant country code and telephone number. Calling into Korea: +82 XX XXXX YYYY. The leading "0" is dropped when dialling into South Korea from abroad. Some 1566/1577/1588 telephone numbers cannot be dialed from abroad. Domestic long-distance call: 0NN (where NN is the carrier code) followed by the 0XX area code and XXXX YYYY number. See Domestic long-distance service code and Area code. Call to cellular : 01N XXXX YYYY (see Mobile phone number). When phone call is made between unified 010-number subscribers, leading 010 can be dropped (XXXX YYYY). Special service call : 0N0 XXXX YYYY (see Special service) For example;

Call 02-312-3456 within Seoul: 312–3456 Call 02-312-3456 from elsewhere: 02–312–3456 Call 051-212-3456 within Busan: 212–3456 Call 051-212-3456 from elsewhere: 051-212-3456 Call 02-312-3456 from abroad: +82-2-312-3456 South Korea uses an open dialing plan with a total length (including 0) of 9 to 11 digits and, within city, subscriber numbers 7 to 8 digits long. Dialing from mobile phones to any type of phone except 010 numbers, the area code must be included. In 1998, telephone numbers in Seoul starting with 2 and 6 added more digit (02-2XX-YYYY to 02-22XX-YYYY, 02-6XX-YYYY to 02-26XX-YYYY). Before area codes were shortened from 4 digit to 2~3 digit in June 2000, there were 1 digit exchange number (usually "2") with some 2 digit exchange numbers so some phone numbers like 0347-61-XXXX, 0443-2-XXXX or 0525-40-XXXX existed. (now 031-761-XXXX, 043-652-XXXX and 055-340-XXXX)

Geographic numbers Before June 2000, South Korea used two- to four-digit area codes.

02 - Seoul and parts of Gyeonggi-do (Gwacheon, Gwangmyeong and some neighbourhoods of Goyang and Hanam) 031 - Gyeonggi-do (except Incheon, Bucheon, Gwacheon, Gwangmyeong and some neighbourhoods of Ansan, Goyang and Hanam) 032 - Parts of Gyeonggi-do (Incheon, Bucheon and some insular communities of Ansan) 033 - Gangwon-do 041 - Chungcheongnam-do (except Daejeon, Sejong and Gyeryong) 042 - Chungcheongnam-do (Daejeon and Gyeryong) 043 - Chungcheongbuk-do 044 - Chungcheongnam-do (Sejong City) 049 - Kaesong Industrial Region (No longer available to call) 051 - Gyeongsangnam-do (Busan) 052 - Gyeongsangnam-do (Ulsan) 053 - Gyeongsangbuk-do (Daegu and Gyeongsan) 054 - Gyeongsangbuk-do (except Daegu and Gyeongsan) 055 - Gyeongsangnam-do (except Busan and Ulsan) 061 - Jeollanam-do (except Gwangju) 062 - Jeollanam-do (Gwangju) 063 - Jeollabuk-do 064 - Jeju-do

Non Geographic numbers

Mobile prefixes From Jan 1, 2004, all mobile phones changed to 010.

010 - Mobile (All South Korea Mobile Phone Companies, from Jan 1, 2004) 0100 - Satellite phone (Globalstar) 011 - Mobile (SK Telecom), until Dec 31, 2003 012 - Machine to machine (Former Beeper) 013x - Mobile special net (wireless vessels etc.) 014xx - Point-to-Point Protocol Access number 015 - Mobile services: Paging services 016 - Mobile (KT) until Jun 30, 2003 017 - Mobile (SK Telecom), until Dec 31, 2003 018 - Mobile (KT), until Jun 30, 2003 019 - Mobile (LG U+), until Dec 31, 2004)

Services 030 - UMS 050 - Personal number service 050x - Anonymous virtual number service 060 - Telephone based intelligent service (Premium-rate) 070 - Internet phone (VoIP) 080 - Toll-free call (some are not free from mobiles)

Domestic long-distance carrier codes It is not necessary to dial any carrier prefix before making a domestic long-distance call. These prefixes are needed only when you want to choose a different carrier other than your default long-distance carrier (usually the same company that provides your phoneline).

081 - KT 082 - LG U+ 083 - Sejong Telecom 084 - SK Broadband 085xx - [Domestic long-distance Value Added Service (VAS)] 086 - SK Telink 087 - (Currently not in use) 088 - (Currently not in use)

Collect call 082-17,1677 - uplus (Dacom) Collect call 1541 - KT Collect call 1677 - Sejong Telecom Collect call 1682 - SK Telink Collect call

Intelligent Network 14XXXX 14XX-XX - KT nationwide single number toll-free service 15XXXXXX 1544-XXXX - LG Dacom(LG U+) nationwide single number service 1566-XXXX - SK Broadband nationwide single number service 1577-XXXX - KT nationwide single number service 1588-XXXX - KT nationwide single number service 1599-XXXX - SK Telink nationwide single number service 16XXXXXX 1661-XXXX - LG U+ nationwide single number service 1688-XXXX - Sejong Telecom nationwide single number service

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Telephone numbers in South Korea

Start with the simplest possible case. Write down what Telephone numbers in South Korea claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Telephone numbers in South Korea before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Telephone numbers in South Korea ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Telephone numbers in South Korea

In research: Telephone numbers in South Korea appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Telephone numbers in South Korea in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Telephone numbers in South Korea is common in secondary-school and first-year university syllabi. It links to neighbouring topics South Korea communications-related lists, Telecommunications in South Korea, Telephone numbers by country, so understanding it makes those chapters shorter.
In everyday life: Look for Telephone numbers in South Korea outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Telephone numbers in South Korea in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Telephone numbers in South Korea means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Telephone numbers in South Korea out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Telephone numbers in South Korea in simple terms?

Telephone numbers in South Korea are organised and assigned under the regulation of the Ministry of Science and ICT, under the Bylaw for the Administration of Telecommunication Numbering. Overview International call out: 00N (where N is the carrier code) followed by the distant country code and tel…

Why does Telephone numbers in South Korea matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Telephone numbers in South Korea?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Telephone numbers in South Korea.